Closure device

ABSTRACT

The closure device ( 121 ) includes interlocking fastening strips ( 130, 131 ) and a slider ( 132 ) slidably disposed on the fastening strips for facilitating the occlusion and deocclusion of the fastening strips ( 130, 131 ) when moved towards first and second ends thereof. A slider ( 132 ) is provided for facilitating the attachment of the slider ( 132 ) onto the fastening strips ( 130, 131 ) in the horizontal X axis ( 102 ). The slider ( 132 ) provides resistance against the removal of the slider ( 132 ) from the fastening strips ( 130, 131 ) in the horizontal X axis ( 102 ) and the vertical Z axis ( 106 ).

FIELD OF THE INVENTION

The present invention relates generally to closure devices and, moreparticularly, to a slider, interlocking fastening strips, and a methodof assembly. The inventive closure device and method may be employed intraditional fastener areas, and is particularly well suited forfastening flexible storage containers, including plastic bags.

BACKGROUND OF THE INVENTION

The use of closure devices for fastening storage containers, includingplastic bags, is generally well known. Furthermore, the manufacture ofclosure devices made of plastic materials is generally known to thoseskilled in the art, as demonstrated by the numerous patents in thisarea.

A particularly well-known use for closure devices is in connection withflexible storage containers, such as plastic bags. In some instances,the closure device and the associated container are formed fromthermoplastic materials, and the closure device and the side walls ofthe container are integrally formed by extrusion as a single piece.Alternatively, the closure device and side walls of the container may beformed as separate pieces and then connected by heat sealing or anyother suitable connecting process. In either event, such closure devicesare particularly useful in providing a closure means for retainingmatter within the bag.

Conventional closure devices typically utilize mating fastening stripsor closure elements which are used to selectively seal the bag. Withsuch closure devices, however, it is often difficult to determinewhether the fastening strips are fully occluded. This problem isparticularly acute when the strips are relatively narrow. Accordingly,when such fastening strips are employed, there exists a reasonablelikelihood that the closure device is at least partially open.

Such fastening strips are also particularly difficult to handle byindividuals with limited manual dexterity. Thus, in order to assistthese individuals and for ease of use by individuals with normaldexterity, the prior art has also provided sliders for use in openingand closing the fastening strips, as disclosed, for example, in U.S.Pat. Nos. 4,199,845, 5,007,142, 5,007,143, 5,010,627, 5,020,194,5,070,583, 5,283,932, 5,301,394, 5,426,830, 5,431,760, 5,442,838, and5,448,808.

During assembly of closure devices utilizing sliders, the sliders areoften mounted onto fastening strips by moving the slider over thefastening strips in the vertical Z axis. Specifically, if thelongitudinal axis of the fastening strips and slider is the X axis, thewidth is the transverse Y axis and the height is the vertical Z axis,the slider is attached to the fastening strips by moving the slider overthe fastening strips in the vertical Z axis. In the past, slidersattached in the vertical Z axis have utilized folding design with thehinge along the X axis such as the sliders in U.S. Pat. Nos. 5,010,627,5,067,208, 5,070,583, and 5,448,808.

Other sliders have used multiple parts which are assembled together suchas the sliders in U.S. Pat. Nos. 5,007,142, 5,283,932 and 5,426,830.

Another method of installing a slider is shown in U.S. Pat. No.5,431,760.

It would be desirable to have a continuous process for attaching aslider to the end of the fastening strips in the horizontal X axis. Sucha device would reduce the manufacturing costs of closure devicesutilizing sliders in addition to providing an effective and reliablemeans of attaching sliders to the fastening strips.

OBJECTS OF THE INVENTION

Accordingly, a general object of the present invention is to provide aslider which overcomes the deficiencies of the prior art.

A more specific object of the present invention is to provide a sliderthat may be attached to fastening strips in the horizontal X axis.

A further object of the present invention is to provide a slider thatmay be attached to the end of the fastening strips in the horizontal Xaxis.

Another object of the present invention is to provide a slider that onceattached prevents itself from being removed from fastening stripsthereafter.

SUMMARY OF THE INVENTION

The inventive closure device is intended for use with a storagecontainer which includes a pair of complementary sheets or opposingflexible side walls, such as a plastic bag. The closure device includesinterlocking fastening strips disposed along respective edge portions ofthe opposing side walls, and a slider slidably disposed on theinterlocking fastening strips for facilitating the occlusion anddeocclusion of the fastening strips when moved towards first and secondends thereof. In accordance with the present invention, a method isprovided for facilitating the attachment of the slider onto thefastening strips in the horizontal X axis. In addition, the slider andfastening strips engage to prevent removal of the slider from thefastening strips in the horizontal X axis. Additionally, the sliderincludes offsets which provide resistance against the removal of theslider from the fastening strips in the vertical Z axis.

These and other objects, features, and advantages of the presentinvention will become more readily apparent upon reading the followingdetailed description of exemplified embodiments and upon reference tothe accompanying drawings herein.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view of a container according to the presentinvention in the form of a plastic bag;

FIG. 2 is a top view of the container in FIG. 1;

FIG. 3 is a partial cross-sectional view of the fastening strips takenalong line 3—3 in FIG. 2;

FIG. 4 is another embodiment of attaching the fastening strips to theside walls of the container;

FIG. 5 is a top view of the slider in FIG. 2;

FIG. 6 is a bottom view of the slider in FIG. 2;

FIG. 7 is a front view of the slider in FIG. 2;

FIG. 8 is a rear view of the slider in FIG. 2;

FIG. 9 is a right side view of the slider in FIG. 2;

FIG. 10 is a cross-sectional view taken along line 10—10 in FIG. 2;

FIG. 11 is a cross-sectional view taken along line 11—11 in FIG. 2;

FIG. 12 is a cross-sectional view taken along line 12—12 in FIG. 2;

FIG. 13 is a right side view of the slider in FIG. 2 and a fragmentaryside view of the container in FIG. 2;

FIG. 14 is a top view of the slider and the fastening strips andillustrates their respective positions to one another as the fasteningstrips are positioned onto the slider;

FIG. 15 is a top view of the slider and the fastening strips andillustrates their respective positions to one another as the fasteningstrips are positioned onto the slider;

FIG. 16 is a top view of the slider and the fastening strips andillustrates their respective positions to one another as the fasteningstrips are positioned onto the slider;

FIG. 16A is a cross-sectional view taken along line 16A—16A in FIG. 16;

FIG. 17 is a top view of the slider and the fastening strips andillustrates their respective positions to one another as the fasteningstrips are positioned onto the slider;

FIG. 17A is a cross-sectional view taken along line 17A—17A in FIG. 17;

FIG. 18 is a top view of the slider and the fastening strips andillustrates their respective positions to one another as the fasteningstrips are positioned onto the slider;

FIG. 18A is a cross-sectional view taken along line 18A—18A in FIG. 18;

FIG. 19 is a perspective view of a system used to attach sliders ontocontainers in the horizontal X axis;

FIG. 20 is a side view of another embodiment of a system used to attachsliders onto containers in the horizontal X axis;

FIG. 21 is a top view of the system in FIG. 20;

FIG. 22 is a side view of another embodiment of the slider and a sideview of another embodiment of the fastening strips;

FIG. 23 is a top view of the slider and fastening strips in FIG. 22;

FIG. 24 is an enlarged partial cross-sectional view taken along line24—24 in FIG. 22;

FIG. 25 is a side view of the slider engaged with an end stop of thefastening strips in FIG. 22;

FIG. 26 is a top view of the slider engaged with the end stop of thefastening-strips in FIG. 22;

FIG. 27 is a top view of the slider and another embodiment of thefastening strips;

FIG. 28 is a rear view of another embodiment of the slider and across-sectional view of another embodiment of the fastening strips; and

FIG. 29 is a rear view of another embodiment of the slider and across-sectional view of another embodiment of the fastening strips.

While the present invention will be described and disclosed inconnection with certain embodiments and procedures, the intent is not tolimit the present invention to these embodiments and procedures. On thecontrary, the intent is to cover all such alternatives, modifications,and equivalents that fall within the spirit and scope of the presentinvention as defined by the appended claims.

DESCRIPTION OF THE EMBODIMENTS

FIGS. 1 and 2 illustrate a container in the form of a plastic bag 120having a sealable closure device 121. The bag 120 includes side walls122, 123 joined at seams 125, 126 to form a compartment sealable bymeans of the closure device 121. The closure device 121 comprises firstand second fastening strips 130, 131 and a slider 132.

The fastening strips 130, 131 and the slider 132 have a longitudinal Xaxis 102 and a transverse Y axis 104 which is perpendicular to thelongitudinal X axis 102. Also, the fastening strips 130, 131 have avertical Z axis 106 which is perpendicular to the longitudinal X axis102 and which is perpendicular to the transverse Y axis 104.

In use, the slider 132 of the present invention facilitates theocclusion and deocclusion of the interlocking fastening strips 130, 131when moved in the appropriate direction along the longitudinal X axis102 of the fastening strips 130, 131. In particular, the slider 132facilitates the occlusion of the interlocking fastening strips 130, 131when moved towards a first end 110 thereof, and facilitates thedeocclusion of the interlocking fastening strips 130, 131 when movedtowards a second end 112 thereof. When the slider 132 is moved in anocclusion direction, as indicated by reference numeral 114 in FIGS. 1and 2, closure of the fastening strips 130, 131 occurs. Conversely, whenthe slider 132 is moved in a deocclusion direction, as indicated byreference numeral 116, separation of the fastening strips 130, 131occurs.

In keeping with a general aspect of the present invention and as will bedescribed in greater detail below, the interlocking fastening strips130, 131 of the present invention may be of virtually any type or formincluding, for example: (1) U-channel fastening strips as best shownherein at FIGS. 3 and 4; (2) “arrowhead-type” fastening strips, as shownherein at FIG. 28; and/or (3) “profile” fastening strips, as disclosedin U.S. Pat. No. 5,664,299 and as shown herein at FIG. 29. All of theabove-identified patents and applications are hereby incorporated byreference in their entireties.

An illustrative example of the type of closure device that may be usedwith the present invention is shown in FIG. 3. The fastening stripsinclude a first fastening strip 130 with a first closure element 136 anda second fastening strip 131 with a second closure element 134. Thefirst closure element 136 engages the second closure element 134. Thefirst fastening strip 130 may include an upper flange 163 disposed atthe upper end of the first fastening strip 130 and a lower flange 167and an offset 169, each disposed at the lower end of the first fasteningstrip 130. The offset 169 is at angle of approximately 60° to the lowerflange 167. Likewise, the second fastening strip 131 may include anupper flange 153 disposed at the upper end of the second fastening strip131 and a lower flange 157 and an offset 159, each disposed at the lowerend of the second fastening strip 131. The offset 159 is at angle ofapproximately 60° to the lower flange 157. The side walls 122, 123 ofthe plastic bag 120 may be attached to the offsets 159, 169 of theirrespective fastening strips 130, 131 by conventional manufacturingtechniques. As shown in FIG. 4, the side walls 622, 623 of the bag mayalso be attached to the outside surfaces of their respective fasteningstrips 630, 631, where the outside surfaces comprise the lower flanges657, 667 and the base portions 638, 648.

The second closure element 134 includes a base portion 138 having a pairof spaced-apart parallely disposed webs 140, 141, extending from thebase portion 138. The webs 140, 141 include hook closure portions 142,144 extending from the webs 140, 141 respectively, and facing towardseach other. The hook closure portions 142, 144 include guide surfaces146, 147 which serve to guide the hook closure portions 142, 144 foroccluding with the hook closure portions 152, 154 of the first closureelement 136.

The first closure element 136 includes a base portion 148 including apair of spaced-apart, parallely disposed webs 150, 151 extending fromthe base portion 148. The webs 150, 151 include hook closure portions152, 154 extending from the webs 150, 151 respectively and facing awayfrom each other. The hook closure portions 152, 154 include guidesurfaces 145, 155, which generally serve to guide the hook closureportions 152, 154 for occlusion with the hook closure portions 142, 144of the second closure element 134. The guide surfaces 145, 155 may alsohave a rounded crown surface. In addition, the hook closure portions144, 154 may be designed so that the hook closure portions 144, 154adjacent the interior of the container provide a greater resistance toopening the closure device 121.

The second fastening strip 131 may or may not include color enhancementmember 135 which is described in U.S. Pat. No. 4,829,641 and which isincorporated herein by reference.

Referring to FIGS. 5–9, the slider 132 includes a housing 160 having atop portion 170, a first side portion 174, and a second side portion176. The top portion 170 provides a separator 172 having a first end 190and a second end 192 where the first end 190 is wider than the secondend 192. The separator 172 is triangular in shape as shown in FIG. 6.

The top portion 170 of the slider merges into a first side portion 174and a second side portion 176. As viewed in FIG. 7, the first sideportion 174 merges into the first front shoulder 240. Likewise, thesecond side portion 176 merges into the second front shoulder 242. Thefront shoulders 240, 242 extend inwardly in the transverse Y axis 104thereby forming a front slot 270 of substantially uniform width as seenin FIGS. 5 and 6. The front shoulders 240, 242 provide radial uppersurfaces or concave surfaces 246, 248 to maintain proper orientation ofthe fastening strips 130, 131 within the slider 132.

Similarly, as viewed in FIG. 8, the first side portion 174 merges intothe first rear shoulder 260. Also, the second side portion 176 mergesinto the second rear shoulder 262. The rear shoulders 260, 262 angleinwardly in the transverse Y axis 104 thus forming a rear slot 280 ofsubstantially uniform width. The rear shoulders 260, 262 also provideradial upper surfaces or concave surfaces 266, 268 to maintain properorientation of the fastening strips 130, 131 within the slider 132.

The first side portion 174 has a first grip 196. Likewise, the secondside portion 176 has a second grip 198. The first grip 196 and thesecond grip 198 extend laterally along the outer surfaces of the sideportions 174, 176 and provide inwardly protruding radial grippingsurfaces 206, 208 as viewed in FIGS. 5 and 6. The radial surfaces 206,208 are designed to correspond to the contour of a person's fingertipsand facilitate grasping the slider 132 during occlusion or deocclusionof the fastening strips 130, 131.

The slider also provides a flexible occlusion member 210 to force thefastening strips 130, 131 together thus effectuating occlusion of thefastening strips 130, 131 when the slider 132 is moved in the occlusiondirection 114. The flexible occlusion member 210 includes a pair offlexible arms 214, 216. The two flexible arms 214, 216 angle inwardlyfrom their respective side portions 174, 176 and project toward thefront of the slider 132 as most easily seen in FIGS. 5 and 6.

In accordance with a principal aspect of the present invention, a slider132 is provided for attaching the slider 132 to the fastening strips130, 131 in the horizontal X axis 102 while preventing the slider 132from being removed from the fastening strips 130, 131 in the horizontalX axis 102 and in the vertical Z axis 106 thereafter.

FIGS. 10–12 illustrate the fastening strips 130, 131 at differentlocations along the separator 172 of the slider 132. FIG. 10 depicts thefastening strips 130, 131 at a location near the second end 192 (thenarrow end) of the separator 172. The separator 172 is located betweenthe flanges 153, 163 of the fastening strips 130, 131. At this location,the upper webs 140, 150 and the lower webs 141, 151 are occluded. FIG.11 illustrates the fastening strips 130, 131 at a location along theseparator 172. The width of the separator 172 at this location forcesthe fastening strips 130, 131 apart in the transverse Y axis 104 and theupper webs 140, 150 of the fastening strips 130, 131 are deoccluded.FIG. 12 shows the fastening strips 130, 131 near the first end 190 (thewide end) of the separator 172. At this position, the width of theseparator 172 deoccludes both the upper webs 140, 141 and the lower webs150, 151 of the fastening strips 130, 131. The flanges 153, 163 of thefastening strips 130, 131 are the only separator 172 engaging surfacesof the fastening strips 130, 131. Consequently, the slider 132 need notforce itself between the webs 140, 141, 150, 151 of the fastening strips130, 131.

As an aspect of the present invention, the shoulders 240, 242, 260, 262prevent removal of the slider 132 from the fastening strips 130, 131 inthe vertical Z axis 106 after the slider 132 has been attached to thefastening strips 130, 131. Moreover, the shoulders 240, 242, 260, 262 ofthe slider 132 provide upper radial or concave surfaces 246, 248, 266,268 which engage the lower flanges 157, 167 of the fastening strips 130,131 to retain the proper orientation of the fastening strips 130, 131within the slider 132. In the event removal of the slider 132 in thevertical Z axis 106 is attempted, the shoulders 240, 242, 260, 262 willprovide resistance against removal of the slider 132. The shoulders 240,242, 260, 262 retain the slider 132 on the fastening strips 130, 131 byresisting vertical Z axis 106 movement of the fastening strips 130, 131through the slots 270, 280. Referring to FIG. 10, if the slider 132 waspulled upward in the Z axis 106, the offset 159 engages the offset 169to prevent the fastening strips from entering the slots 270, 280. Inaddition, the lower flanges 157, 167 engage the upper radial or concavesurfaces 246, 248, 266, 268 to prevent the fastening strips fromentering the slots 270, 280. As a result, the slider 132 may only beremoved from the fastening strips 130, 131 in the vertical Z axis 106 byeither tearing through the fastening strips 130, 131 or breaking and/orby deforming the shoulders 240, 242, 260, 262 of the slider 132.

FIG. 13 illustrates the respective vertical positions of the slider 132and container 120 immediately prior to attaching the slider 132 onto thefastening strips 130, 131. The container 120 provides a seam 125 at theend of the fastening strips 130, 131. At the seam 125, the fasteningstrips 130, 131 are melted together which effectively occludes thefastening strips 130, 131. During attachment of the slider onto thefastening strips in the horizontal X axis 102, the separator 172 of theslider 132 extends below the top of the fastening strips 130, 131 adistance 290. Consequently, the seam 125 of the fastening strips has anopening at least a minimum distance 290 from the top of the fasteningstrips 130, 131 to permit insertion of the separator 172 between thefastening strips 130, 131 during attachment of the slider 132 onto thefastening strips 130, 131 in the horizontal X axis 102.

FIGS. 14–18 sequentially illustrate the attachment of the slider 132onto the fastening strips 130, 131 in the horizontal X axis 102. FIG. 14depicts occluded fastening strips 130, 131 and a slider 132 having aflexible occlusion member 210 in a relaxed position. The occludedfastening strips 130, 131 are positioned between the first side portion174 and the second side portion 176 immediately above the rear slot 280.Referring to FIG. 15, the fastening strips 130, 131 are moved in thehorizontal X axis 102 toward the slider 132. The fastening strips 130,131 engage the legs 214, 216 of the flexible occlusion member 210 anddeflect the legs 214, 216 outwardly in the transverse Y axis 104 towardtheir respective side portions 174, 176 thus permitting passage of theseam 125 and fastening strips 130, 131. The seam 125 has protrusions291, 292 which are created during the thermal cutting of the seam 125.

As shown in FIG. 16, upon further movement of the fastening strips 130,131 toward the slider 132 in the horizontal X axis 102, the seam 125 andthe fastening strips 130, 131 project through the legs 214, 216 of theflexible occlusion member 210. The legs 214, 216 move toward each otherafter the seam 125 passes through the legs 214, 216 of the flexibleocclusion member 210. The second end 192 of the separator 172 ispositioned against the seam 125 of the fastening strips 130, 131 and isproperly aligned to fit between the flanges 153, 163 of the fasteningstrips 130, 131 as seen in FIG. 16A.

As an aspect of the present invention, the flexible occlusion member 210allows the slider 132 to accommodate fastening strips of differentwidths and/or varying width. Specifically, the flexible occlusion membercan flex to accommodate fastening strips of different widths and/orvarying widths, but can also exert sufficient force to occlude thefastening strips.

It will be appreciated by those skilled in the art that the presentinvention may be embodied in a variety of configurations. The resistancewhich the flexible occlusion member provides during attachment of theslider onto the fastening strips in the horizontal X axis may beaffected by varying the dimensions and/or material composition of theslider design.

In addition, by properly selecting the slider material, the flexibleocclusion member 210 can be relied upon to self adjust with time to thewidth of the fastening strips. Most plastics will “take a set”(self-adjust with time) to an external stress. Furthermore, due tomanufacturing tolerances, the width of the fastening strips may varyalong the length, and in addition the width of the slider may vary fromone slider to another slider. As an example, if the fastening strips arewide, then the occlusion member 210 will self-adjust or take a set tothe wide fastening strips and thereby allow the slider to maintain a lowslide force. As another example, if the slider is narrow or tightfitting, then the occlusion member 210 will self-adjust or take a set tothe narrow or tight fitting slider and thereby allow the slider tomaintain a low slide force. As a further example, the occlusion member210 will also self-adjust or take a set to narrow fastening stripsand/or a wide slider. If the plastic material did not take a set, thenwide fastening strips or a tight fitting slider would have a high slideforce. Proper selection of material will allow the slider to self adjustto the width of the fastening strips soon after installation and priorto the expected delivery to the consumer.

As seen in FIG. 17, further movement of the fastening strips 130, 131 inthe horizontal Z axis 102 forces the separator 172 of the slider 132between the flanges 153, 163 of the fastening strips 130, 131. FIG. 17Ashows the middle of separator 172 positioned between the fasteningstrips 130, 131 near the seam 125. In accordance with one feature of theinvention, FIGS. 17A and 18A demonstrate that the fastening strips 130,131 will have a leak proof seal when the slider 132 is in the endposition.

The leak proof seal is created even though the separator 172 extendsbetween flanges 153, 163 of the fastening strips 130, 131. Specifically,the fastening strips 130, 131 are effected not only by the forces actingupon them by the separator 172 at that location but are also by theposition of the fastening strips 130, 131 at locations before and afterthat location. For example, with respect to the position of thefastening strips 130, 131 in FIGS. 17A and 18A, the webs 140, 141, 150,151 are effected by the seam 125 at the end of the fastening strips 130,131. The seam 125 prevents deocclsuion of the fastening strips by theseparator 172.

When the separator 172 is positioned at the locations shown in FIGS. 17and 18 (17A and 18A), the webs 140, 141, 150, 151 of the fasteningstrips 130, 131 would usually be deoccluded as shown in FIGS. 11–12.When the slider 132 moves to the locations shown in FIGS. 15–17, thewebs 140, 141, 150, 151 are already occluded and the separating actionof the separator 172 is not able to overcome the occlusion effect of theseam 125. Consequently, the fastening strips 130, 131 remain occludedthrough the length of the fastening strips and establish a leak proofseal when fully occluded.

It will be appreciated by those skilled in the art that a number ofdifferent methods may be used to attach sliders to fastening strips inthe horizontal X axis. These methods may include manually insertingfastening strips through sliders. Because manual insertion is cumbersomeand inefficient from an economic and production standpoint, automatedinsertion of the fastening strips through the sliders is desirable.

FIG. 19 illustrates an automated rotary system 300 that effectivelyinserts fastening strips 130, 131 through sliders 132 in the horizontalX axis 102. The rotary system 300 includes a first drum 310 and a seconddrum 320 which rotate about a single axis. The first drum 310 has afirst end 314 and a second end 316 and rotates in a clockwise direction304 at a first radial speed as viewed in FIG. 19. The perimeter of thefirst drum 310 provides holes 318 to which a controllable vacuum isconnected. The vacuum holes 318 provide a means for securing thecontainers 120 to and releasing the containers 120 from the perimeter ofthe first drum 310 during production. The containers 120 are positionedonto the first drum 310 such that the fastening strips 130, 131 of thecontainers 120 are disposed along the first end 314 of the first drum310.

The second drum 320 has a first end 324 and a second end 326 and rotatesat a second radial speed also in a clockwise direction 304 as viewed inFIG. 19. The second radial speed is less than the first radial speed.Accordingly, the first drum 310 rotates faster than the second drum 320.The second drum 320 includes a number of axially extending channels 326.Disposed within each channel 326 is a slider retaining cartridge 328.

In operation, a container 120 is placed on the first drum 310 atposition 330 or an earlier position. The vacuum of the first drum 310 isused to attach the container 120 to the surface of the first drum. Thecontainers 120 rotate as the first drum 310 rotates and the containersachieve various positions 330, 332, 334, 336, 338 as shown in FIG. 19.The cartridges 328 of the second drum 320 receive sliders 132 at thesecond end 326 of the second drum 320 at position 340 or an earlierposition. The cartridges 328 and sliders 132 rotate as the second drum320 rotates and the cartridges 328 achieve various positions 340, 342,344, 346, 348 as shown in FIG. 19. The cartridges 328 with the sliders132 move to the first end 324 of the second drum 320 and achieve variouspositions 340, 342, 344, 346 as shown in FIG. 19. Prior to position 346,the sliders extend beyond the second drum 320 and into the path of thecontainers 120 on the first drum 310.

The containers 120 attached to the first drum 310 are traveling at agreater radial speed than the sliders 132 and cartridges 328 on thesecond drum 320. Consequently, each set of fastening strips 130, 131 areinserted within a slider 132 in the horizontal X axis 102 as thefastening strips 130, 131 pass a cartridge 328 and slider 132 as shownin position 346. After the fastening strips 130, 131 are inserted withinthe slider 132, the slider 132 is disengaged from the cartridge 328 asshown in position 348. The container 120 with the slider 132 thenrotates on the first drum 310 to position 346 or a later position andthe vacuum retaining the container 120 to the first drum 310 ismomentarily turned off to release the container 120 with the slider 132.The vacuum is subsequently turned on to secure another container 120 tothe surface of the first drum 310 to repeat the process.

Another embodiment of an automated production system that attachesfastening strips 130, 131 to sliders 132 in the horizontal X axis 102 isillustrated in FIGS. 20 and 21. This conveyor system 400 may include anynumber of conveyors 440, 460 and slider feeders 470. However, forpurposes of clarity and convenience, the description will be limited toan upper conveyor 440 and a lower conveyor 460. The conveyor system 400illustrated in FIGS. 20 and 21 includes a drum 410, an upper conveyor440, a lower conveyor 440 and a slider feeder 470.

The drum 410 rotates in a clockwise direction 404 as viewed in FIG. 21and supplies containers 120 to the upper conveyor 440 and lower conveyor460. The perimeter of the drum 410 provides holes 441 to which acontrollable vacuum is connected. The vacuum holes 441 provide a meansfor securing containers 120 to and releasing containers 120 from theperimeter of the drum 410 during production.

The conveyors 440, 460 also provide holes 442 to which a controllablevacuum is connected. The vacuum holes 442 provide a means for securingcontainers 120 to and releasing containers 120 from the conveyors 440,460 during production. The containers 120 are positioned onto theconveyors 440, 460 by the drum 410 such that the fastening strips 130,131 are located on the inside edge of its respective conveyor. Theconveyors 440, 460 move in direction 462 and the containers 120 travelfrom the first end 464 of the conveyors to the second end 466 of theconveyors.

Slider feeders 470 such as vibrating drum feeders are provided to supplysliders 132 through a channel 476 to the slider holding mechanism 480.The slider holding mechanism 480 is located at the inside edge of eachconveyor. As the container 120 with the fastening strips 130, 131travels along the conveyor 440, 460 and reaches the slider holdingmechanism 480, the conveyor 440, 460 moves the fastening strips 130, 131through the slider 132 in the horizontal X axis 102. After the slider132 has been inserted on the fastening strips, the slider 132 isreleased from slider holding mechanism 480. The container 120 with theslider 132 then travels to the second end 466 of the conveyor 440, 460until the vacuum retaining the container 120 to the conveyor 440, 460 ismomentarily turned off to release the container with the slider.

The lower conveyor 460 operates in a similar fashion. The purpose ofusing upper and lower conveyors 440, 460 is to create space 482 betweenthe containers 120. As the drum 410 rotates, the containers 120 areplaced on the conveyors 440, 460 in an alternating fashion. For example,a first container 120 is placed on conveyor 440, a second container 120is placed on conveyor 460, a third container 120 is placed on conveyor440, a fourth container 120 is placed on a conveyor 440 and thisalternating sequence continues. Thus, the alternating sequence createsthe space 482 between the containers on the conveyors 440, 460.

The present invention also prevents removal of the slider from thefastening strips in the horizontal X axis 102 once the slider has beenattached to the fastening strips. FIGS. 22–27 illustrate a slider 1132having a first and second set of retaining jaws 1200, 1210. The firstset of retaining jaws 1200 are provided at the first end 1190 of theslider 1132. The second set of retaining jaws 1210 are provided at thesecond end 1192 of the slider 1132. As most easily seen in FIGS. 23–24,the retaining jaws 1200, 1210 extend outward from the top of the slider1132 and angle inwardly in the transverse Y axis 104 to form a firstupper slot 1270 and a second upper slot 1272. When the slider 1132 isattached to the fastening strips 1130, 1131, the retaining jaws 1200,1210 are positioned above the top of the fastening strips 1130,

-   -   as seen in FIGS. 22 and 24.

FIGS. 22–23 illustrate first and second crimped end stops 1135, 1137provided at each end of the fastening strips 1130, 1131. The end stops1135, 1137 include detents 1140 and protrusions 1142 for engagement withthe retaining jaws 1200, 1210. The crimped end stops 1135, 1137 alsoextend above the top of the fastening strips 1130, 1131 to correspondwith the vertical position of the retaining jaws 1200, 1210. Once theslider 1132 is moved a sufficient distance along the fastening strips1130, 1131 in the horizontal X axis 102, the respective retaining jaws1200, 1210 engages the corresponding crimped end stop 1135, 1137.

For example, if the slider 1132 is continually moved in the deocclusiondirection 116, the second set of retaining jaws 1210 will eventuallyengage detents 1140 and protrusions 1142 on the crimped end stop 1137 asshown in FIGS. 25–26. Specifically, the upper slot 1272 has a width 1280which is less than the width 1282 of the protrusions 1142 on the endstop 1137. In addition, the width 1280 of the upper slot is equal to orless than the width 1284 of the detents 1140. As the jaws 1210 engagethe end stop 1137, the jaws 1210 engage the detents 1140. As the jaws1210 move forward, the jaws engage the protrusions 1142 and are stoppedby the protrusions 1142. The width 1280 of the slot is less than thewidth 1282 of the protrusions 1142. In addition, the jaws 1210 are notable to deflect to increase the width 1280 of the slot. Thus, theretaining jaws 1210 will resist further movement of the slider 1132 inthe horizontal X axis 102 in the deocclusion direction 116. As a result,the slider 1132 may only be removed from the fastening strips 1130, 1131in the horizontal X axis 102 by either tearing through the end stops orby breaking and/or deforming the retaining jaws 1200, 1210 of the slider1132.

FIG. 27 illustrates another embodiment of end stops 2135, 2137 that maybe used with the retaining jaws 2200, 2210 similar to the embodimentshown in FIGS. 22–26. However, the wedge end stops 2135, 2137 of FIG. 27angle outwardly at the respective ends of the fastening strips 2130,2131 thereby increasing the width 2284 of the end stop. The retainingjaws 2200, 2210 also utilize the increase in the width 2284 of the endstops 2135, 2137 to engage the retaining jaws 2200, 2210 as well as theprotrusions 2142 provided along the outer surface of the wedge stops2135, 2137. The width 2284 of the wedge end stops 2135, 2137 increasesto a width greater than the width 2280 of the upper slots 2270, 2272.Once the retaining jaws 2200, 2210 engage the end stops 2135, 2137, thewidth 2284 of the end stops and the width 2282 of the protrusions 2142prevent further horizontal movement of the slider 2132 in the horizontalX axis 102.

In another embodiment, the slider may have a single jaw on the end ofthe slider to engage the end stop. Since the jaw will not deflect, theslider will stop when the jaw engages the protrusion and/or theincreasing width of the end stop. Furthermore, in an additionalembodiment, the slider may have a single jaw on each end of the slider.

FIGS. 28–29 illustrate interlocking fastening strips of differentconfigurations and the corresponding slider design. As shown in FIG. 28,the interlocking fastening strips 3130, 3131 may alternatively comprise“arrowhead-type” closure elements which are used with a slider 3132.

Additionally, the interlocking fastening strips 4130, 4131 may comprise“profile” closure elements which are used with a slider 4132, as shownin FIG. 29. These closure elements are described in U.S. Pat. No.5,664,299.

Although several interlocking fastening strip embodiments have beenspecifically described and illustrated herein, it will be readilyappreciated by those skilled in the art that other kinds, types, orforms of fastening strips may alternatively be used without departingfrom the scope or spirit of the present invention.

The interlocking fastening strips of the present invention may bemanufactured by extrusion through a die. In addition, the fasteningstrips may be manufactured to have approximately uniform cross-sections.This not only simplifies the manufacturing of a closure device, but alsocontributes to the physical flexibility of the closure device.

Generally, the interlocking fastening strips of the present inventionmay be formed from any suitable thermoplastic material including, forexample, polyethylene, polypropylene, nylon, or the like, or from acombination thereof. Thus, resins or mixtures of resins such as highdensity polyethylene, medium density polyethylene, and low densitypolyethylene may be employed to prepare the interlocking fasteningstrips of the present invention. In most instances, the fastening stripsare made from low density polyethylene. The selection of the appropriatethermoplastic material, however, is related to the particular design ofthe fastening strips, the Young's Modulus of the thermoplastic material,and the desired elasticity and flexibility of the strips.

When the fastening strips of the present invention are used in asealable bag, the fastening strips and the films that form the body ofthe bag may be conveniently manufactured from heat sealable material. Inthis way, the bag may be economically formed by using an aforementionedthermoplastic material and by heat sealing the fastening strips to thebag. In most instances, the bag is made from a mixture of high pressure,low density polyethylene and linear, low density polyethylene.

The fastening strips of the present invention may be manufactured byextrusion or other known methods. For example, the closure device may bemanufactured as individual fastening strips for later attachment to thebag or may be manufactured integrally with the bag. In addition, thefastening strips may be manufactured with or without flange portions onone or both of the fastening strips depending upon the intended use ofthe closure device or expected additional manufacturing operations.

Generally, the closure device of the present invention can bemanufactured in a variety of forms to suit the intended use. Inpracticing the present invention, the closure device may be integrallyformed on the opposing side walls of the container or bag, or connectedto the container by the use of any of many known methods. For example, athermoelectric device may be applied to a film in contact with theflange portion of the fastening strips or the thermoelectric device maybe applied to a film in contact with the base portion of fasteningstrips having no flange portion, to cause a transfer of heat through thefilm to produce melting at the interface of the film and a flangeportion or base portion of the fastening strips. Suitable thermoelectricdevices include heated rotary discs, traveling heater bands,resistance-heated slide wires, and the like. The connection between thefilm and the fastening strips may also be established by the use of hotmelt adhesives, hot jets of air to the interface, ultrasonic heating, orother known methods. The bonding of the fastening strips to the filmstock may be carried out either before or after the film is U-folded toform the bag. In any event, such bonding is done prior to side sealingthe bag at the edges by conventional thermal cutting. In addition, thefirst and second fastening strips may be positioned on opposite sides ofthe film. Such an embodiment would be suited for wrapping an object or acollection of objects such as wires. The first and second fasteningstrips should usually be positioned on the film in a generally parallelrelationship with respect to each other, although this will depend onthe intended use.

The slider may be multiple parts and snapped together. In addition, theslider may be made from multiple parts and fused or welded together. Theslider may also be a one piece construction. The slider can be colored,opaque, translucent or transparent. The slider may be injection moldedor made by any other method. The slider may be molded from any suitableplastic material, such as, nylon, polypropylene, polystyrene, acetal,toughened acetal, polyketone, polybutylene terrephthalate, high densitypolyethylene, polycarbonate or ABS (acrylonitrile-butadiene-styrene).

In summary, the present invention affords a closure device withinterlocking fastening strips, a slider which facilitates the occlusionand deocclusion of the fastening strips, and a method which facilitatesattachment of the slider onto the fastening strips in the horizontal Xaxis. In addition, the closure device prevents the removal of the sliderfrom the fastening strips in the horizontal x axis and in the vertical Zaxis.

From the foregoing it will be understood that modifications andvariations may be effectuated to the disclosed structures—particularlyin light of the foregoing teachings—without departing from the scope orspirit of the present invention. As such, no limitation with respect tothe specific embodiments described and illustrated herein is intended orshould be inferred. Indeed, the following claims are intended to coverall modifications and variations that fall within the scope and spiritof the present invention. In addition, all references and copendingapplications cited herein are hereby incorporated by reference in theirentireties.

1. A closure device comprising: a first fastening strip; a secondfastening strip; a slider adapted to be slidably disposed on saidfastening strips and facilitating the occlusion of said fastening stripswhen moved in an occlusion direction towards a first end thereof andfacilitating the deocclusion of said fastening snips when moved towardsa second end thereof, said fastening strips and said slider having alongitudinal X axis and a transverse Y axis, said transverse Y axisbeing perpendicular to said longitudinal X axis, said fastening stripsand said slider having a vertical Z axis, said vertical Z axis beingperpendicular to said longitudinal X axis, said vertical Z axis beingperpendicular to said transverse Y axis, said slider comprising ahousing having a first side portion, a second side portion and aflexible occlusion member for facilitating occlusion of said fasteningstrips when said slider is moved to said first end of said fasteningstrips; wherein said flexible occlusion member comprises a first leg forengaging said first fastening strip and a second leg for engaging saidsecond fastening strip, wherein said first and second legs extendinwardly in the longitudinal X axis towards the occlusion direction fromthe first and second side portions, respectively.
 2. The closure deviceas in claim 1 wherein said fastening strips are disposed between saidfirst and second legs.
 3. The closure device as in claim 1 wherein saidflexible occlusion member has a first position prior to attaching saidslider to the first fastening strip and a second position when saidflexible occlusion member is attached the first fastening strip.
 4. Theclosure device as in claim 3 wherein the second position is deflectedfrom the first position.
 5. The closure device as in claim 1 whereinsaid first leg has a first position prior to attaching said slider tothe first fastening strip and a second position when said first leg isattached to the first fastening strip.
 6. The closure device as in claim5 wherein the second position is deflected from the first position. 7.The closure device as in claim 1 wherein said first leg flexes forfacilitating the attachment of said slider onto said fastening strips insaid longitudinal X axis.
 8. The closure device as in claim 1 whereinsaid second leg flexes for facilitating the attachment of said slideronto said fastening strips in said longitudinal X axis.
 9. The closuredevice as in claim 1 wherein said fastening strips have a first widthand a second width, said flexible occlusion member has a first positionfor the first width and a second position for the second width.
 10. Theclosure device as in claim 9 wherein said flexible occlusion member willtake a set to the first position.
 11. The closure device as in claim 9wherein said flexible occlusion member will take a set to the secondposition.
 12. The closure device as in claim 1 wherein said fasteningstrips have a first width, said slider can be used with a second set offastening strips having a second width, said flexible occlusion memberhas a first position for the first width and a second position for thesecond width.
 13. The closure device as in claim 12 wherein saidflexible occlusion member will take a set to the first position.
 14. Theclosure device as in claim 12 wherein said flexible occlusion memberwill take a set to the second position.
 15. The closure device as inclaim 1 wherein said fastening strips comprise U-channel type fasteningstrips.
 16. The closure device as in claim 1 wherein said fasteningstrips comprise arrowhead type fastening strips.
 17. The closure deviceas in claim 1 wherein said fastening strips comprise profile typefastening strips.
 18. A slider adapted to be slidably disposed on firstand second fastening strips, said slider facilitating the occlusion ofsaid fastening strips when moved in an occlusion direction towards afirst end thereof and facilitating the deocclusion of said fasteningstrips when moved towards a second end thereof, said slider comprising:a longitudinal X axis and a transverse Y axis, said transverse Y axisbeing perpendicular to said longitudinal X axis, said slider having avertical Z axis, said vertical Z axis being perpendicular to saidlongitudinal X axis, said vertical Z axis being perpendicular to saidtransverse Y axis; a housing having a first side portion, a second sideportion and a flexible occlusion member for facilitating occlusion ofsaid fastening strips when said slider is moved to said first end ofsaid fastening strips; wherein said flexible occlusion member comprisesa first leg for engaging said first fastening strip and a second leg forengaging said second fastening strip, wherein said first and second legsextend inwardly in the longitudinal X axis towards the occlusiondirection from the first and second side portions, respectively.
 19. Theslider as in claim 18, wherein said flexible occlusion member comprisesa second inwardly biased leg for engaging said second fastening strip.20. The slider as in claim 18 wherein said fastening strips are disposedbetween said first and second legs.
 21. The slider as in claim 18wherein said flexible occlusion member has a first position prior toattaching said slider to the first fastening strip and a second positionwhen said flexible occlusion member is attached to the first fasteningstrip.
 22. The slider as in claim 21 wherein the second position isdeflected from the first position.
 23. The slider as in claim 18 whereinsaid first leg has a first position prior to attaching said slider tothe first fastening strip and a second position when said first leg isattached to the first fastening strip.
 24. The slider as in claim 23wherein the second position is deflected from the first position. 25.The slider as in claim 18 wherein said first leg flexes for facilitatingthe attachment of said slider onto said fastening strips in saidlongitudinal X axis.
 26. The slider as in claim 18 wherein said secondleg flexes for facilitating the attachment of said slider onto saidfastening strips in said longitudinal X axis.
 27. The slider as in claim18 wherein said fastening strips have a first width and a second width,said flexible occlusion member has a first position for the first widthand a second position for the second width.
 28. The slider as in claim27 wherein said flexible occlusion member will take a set to the firstposition.
 29. The slider as in claim 27 wherein said flexible occlusionmember will take a set to the second position.
 30. The slider as inclaim 18 wherein said fastening strips have a first width, said slidercan be used with a second set of fastening strips having a second width,said flexible occlusion member has a first position for the first widthand a second position for the second width.
 31. The slider as in claim30 wherein said flexible occlusion member will take a set to the firstposition.
 32. The slider as in claim 30 wherein said flexible occlusionmember will take a set to the second position.
 33. A containercomprising: first and second side walls, said first and second sidewalls including mating first and second fastening strips respectively,said first and second fastening strips comprising a closure devicearranged to be interlocked over a predetermined length, a slider adaptedto be slidably disposed on said fastening strips and facilitating theocclusion of said fastening strips when moved in an occlusion directiontowards a first end thereof and facilitating the deocclusion of saidfastening strips when moved towards a second end thereof, said fasteningstrips and said slider having a longitudinal X axis and a transverse Yaxis, said transverse Y axis being perpendicular to said longitudinal Xaxis, said fastening strips and said slider having a vertical Z axis,said vertical Z axis being perpendicular to said longitudinal X axis,said vertical Z axis being perpendicular to said transverse Y axis, saidslider comprising a housing having a first side portion, a second sideportion and a flexible occlusion member for facilitating occlusion ofsaid fastening strips when said slider is moved to said first end ofsaid fastening strips; wherein said flexible occlusion member comprisesa first leg for engaging said first fastening strip and a second forengaging said second fastening strip, wherein said first and second legsextend inwardly in the longitudinal X axis towards the occlusiondirection from the first and second side portions, respectively.
 34. Thecontainer as in claim 33 wherein said fastening strips are disposedbetween said first and second legs.
 35. The container as in claim 33wherein said flexible occlusion member has a first position prior toattaching said slider to the first fastening strip and a second positionwhen said flexible occlusion member is attached to the first fasteningstrip.
 36. The container as in claim 35 wherein the second position isdeflected from the first position.
 37. The container as in claim 33wherein said first leg has a first position prior to attaching saidslider to the first fastening strip and a second position when saidfirst leg is attached to the first fastening strip.
 38. The container asin claim 37 wherein the second position is deflected from the firstposition.
 39. The container as in claim 33 wherein said first leg flexesfor facilitating the attachment of said slider onto said fasteningstrips in said longitudinal X axis.
 40. The container as in claim 33wherein said second leg flexes for facilitating the attachment of saidslider onto said fastening strips in said longitudinal X axis.
 41. Thecontainer as in claim 33 wherein said fastening strips have a firstwidth and a second width, said flexible occlusion member has a firstposition for the first width and a second position for the second width.42. The container as in claim 41 wherein said flexible occlusion memberwill take a set to the first position.
 43. The container as in claim 41wherein said flexible occlusion member will take a set to the secondposition.
 44. The container as in claim 33 wherein said fastening stripshave a first width, said slider can be used with a second set offastening strips having a second width, said flexible occlusion memberhas a first position for the first width and a second position for thesecond width.
 45. The container as in claim 44 wherein said flexibleocclusion member will take a set to the first position.
 46. Thecontainer as in claim 44 wherein said flexible occlusion member willtake a set to the second position.
 47. The container as in claim 33wherein said fastening strips comprise U-channel type fastening strips.48. The container as in claim 33 wherein said fastening strips comprisearrowhead type fastening strips.
 49. The container as in claim 33wherein said fastening strips comprise profile type fastening strips.50. A slider adapted to be slidably disposed on first and secondfastening strips, said slider facilitating the occlusion of saidfastening strips when moved in an occlusion direction towards a firstend thereof and facilitating the deocclusion of said fastening stripswhen moved towards a second end thereof, said slider comprising: alongitudinal X axis and a transverse Y axis, said transverse Y axisbeing perpendicular to said longitudinal X axis, said slider having avertical Z axis, said vertical Z axis being perpendicular to saidlongitudinal X axis, said vertical Z axis being perpendicular to saidtransverse Y axis; a housing having a flexible occlusion member forfacilitating occlusion of said fastening strips when said slider ismoved to said first end of said fastening strips, wherein said flexibleocclusion member comprises a first leg for engaging said first fasteningstrip and a second leg for engaging said second fastening strip, whereinsaid legs extend in the longitudinal X axis toward the occlusiondirection and flex in the direction of the transverse Y axis.